Construction of centrifugal pumps.



No. 887,658. PATENTED MAY 12, 1908.

F. W. KROGH.

CONSTRUCTION OF GENTRIFUGAL PUMPS.

I APPLICATION FILED FEB. 3, 1906.

2 SHEETS-SHEET 1.

ATT RNEY.

2 SHEETS-SHEET 2.

ATTORNEY? PATENTED MAY 12, 1908. F. W. KROGH.

APPLICATION FILED mm. a, 1900.

CONSTRUCTION OF GENTRIFUGAL PUMPS.

WI TNESSE'S;

. ugal pumps in the side of impeller 4 peller 4, the lining 5, is

- UNITED STAT 'FERDINAND W. KROGH, or SAN FRANOISCO, CALIFORNIA:

CONSTBUCTION OF CENTBIFUGAL PUMPS.

T 0 all whom it may concern:

Be it known that I, FERDINAND W. Kao'en, a citizen of the United States, residing at No. 2506 Sutter street,- San Francisco, in the county of San Francisco and State of California, have invented certain new and useful improvements in the construction of centrif- Which the passage of stones, gravel, and other foreign material is prevented from injuring impeller and walls of um and. the running joints and shaftearing, as will hereinafter be described, and pointed out in the claims at the end of this specification. j

My invention may be said to consist of new and novel introduction -of parts together with the constructionof pump for the embodiment of same and is particularly applicable in the class of pumps known as dredgin" pumps and Where sand and gravel forms a arge share of the substance pumped. attain this object in the manner illustrated in accompanying drawings, in which Figure 1 is apart sectional elevation of pump, also showing a section through the discharge passage of the impeller. Fig. 2, is a side elevation of the same havin cover and suction .elbow removed and showing discharge nozzle partly in-section. Fig. 3, shows a sectional side elevation of impeller. Fig. 4, is the combined sectional elevation of same showing discharge passage and also the communication passage to back or shaft side of impeller. Fig. 5, is a plan view of valve closing this communication to back or shaft side of im eller and Fig. 6, is a sectiona'l elevation of said valve.

Similar numbers refer to similar parts throughout the several views.

Fig. 1, being a sectional elevation of pump has its usual suction elbow 1, the body ofpump chamber or casing 2 and thecover 3 for same, and. the impeller 4 which latter is as will be seen lined with a suitable material as steel. I This lining 5 which is ap lied in the entlredischarge passage is fitted c ose against I on the suction side of same, whereas on the shaft side of said imcushioning means or springs 6, the object being that the im )act or shock due to stones relieved and no injury impeller to that as shown in Fig.

being carried in t ough the suction will 'be done from this cause. Referring'to Fig. 3, it is further seen, that the adjacent sides of discharge passage of 1, has the I Specification of Letters Patent. Application filed February 3, 1.906. Serial No. 299,251.

I- lining partly close clear of this side by g and partly clear to the extent of the space taken up by springs similarly applied, the object being to more effectually protect this part of the passage, which due to the direction of travel as-indicated by arrow, will be subjected to harder wear and shocks. The springs 6, being attached by rivets or otherwise to lining 5, will always retain their position in relation to same and may be of any desired size, shape or number. The inside circumference of pump-chamber 2, is also lined as seen by lining 7. This lining goes nearly all around circumference and partly into discharge opening 8, as seen in ig. 2. The lining 7 is held against cast in one with pump chamber 2- and cover 3-, by means of a series of springs 10 of similar size and shape as used for impeller 4. It is clear that this lining 7, forms, an effective and postive projection against wear due to sand, gravel or other sharp cutting substances, and also prevents injury to pump chamber from impact of stones, which have been known to actually break through the pump chamber, due to their wei ht and the speed with which they trave The springs 10, are attached to lining 7 by rivets, or other suitable means.

Referring to Fig. 3, it'is seen that a direct passage 11 obtains from the circumferential portion of impeller 4 to the central water space underneath the angle rings12, on the. back or shaft side of said impeller 4; and this assage which may be more than one in numiier is automaticall kept closed by valves 13 due to resilience of sprmgs 14, the object of this innovation being that as the impeller 4 revolves, the valves 13 will be kept open due to the centrifu al force acting on same, whereas when t 1e pum is stopped these valves 13 will automatica ly close, thus an effective passage for balancing impeller is maintained and at the same time can no sand or foreign material pass in and do injury to shaft bearing. It is further seen that a series of valve and pipe connections are carried from some source of clean water supply 15, the valves 16 and pipes 17 carryin water to both sides of the impeller will fill the double object of keepin I spaces clean and for balancing the impe ler, one valve being more open than the other as wanted, valve or cock 18 with pipe connection 19 will sup ly clean water to central space on back or s aft side of impeller, and as pump is running be drawn- Patented May 12, 1908.

the circular projecting rings 9 out through communication passage 11 also keeping valve seat and valves clean, at the end of said communication passage 11., further will the valve with communication pipe 21 supply water to the back of lining 7 or pump chamber or casing keeping this space clean and the channel 22 is provided as an exit on the one side of lining where it fits close for any sand or gravel tending to find lodgment. tion 24 is intended as a further drain and outlet for water sup lied to back of lining 7.

Having thus escribed my invention what I claim and desire to obtain by Letters Patent is i i 1. In a centrifugal pump, the combination of an impeller having radiating water passages, a lining for the said passages, the lining being in part secured close against the body of the impeller'and in part separated therefrom, and cushioning springs interposed between the frame of the impeller and the parts of the lining that are set away therefrom.

2. In a centrifugal pump, the combination of an impeller having radiating passages, and linings for the opposite faces of the said passages, the lining on the forward side being set close against the face of the wall of the passage and the lining on the opposite or rear side being set away from the wall of the passage, and cushionlng sprlngs set between the last said linin r and the wall which it protects, substantial y as set forth.

3. In a centrifugal pump, the combination of an impeller having a water inlet at its center and radiating passages extending outward therefrom, the inner ends of opposite passages uniting at the center of the impeller,

inings for the front and rear walls of the said passages, each lining lying close against the front or forward wall of one passage and set away from the back or following wall of the opposite passage, and cushioning springs between the set-out portions of the lining and the rear or following walls of the passages of the impeller.

4. In a centrifugal pump, the combination of a casing, a rotary impeller mounted therein and provided with radiating discharge passages, and communicating passages from the back to the periphery of said impeller, and balancing valves for opening and closing said communicating passages.

The valve 23 with pipe connec- 5. In a centrifugal pump, the combination of a casing, a rotary. impeller mounted therein and provided with radiating discharge passages, and communicating passagesfrom the back to the periphery of said impeller, and automatically operated balancing valves for opening and closing said communicating passages.

6. In a centrifugal pump, the combination I of a casing, an impeller mounted therein and provided with discharge passages and communicating passages extending from the back to the periphery'thereof, valves con trolling said communicating passages, and connections for supplying water to said communicating passages.

7. In a centrifugal pump, the combination with-the casing and a cover therefor, of a pair of annular flanges,one on the casing and one on the cover,on the inside thereof, a lining arranged .to extend around and rest on said flanges and springs interposed be tween the lining and the casing.

8. In a,centrifugal pump a lining protected chamber orcasing, springs attached to said lining, a drain valve and pipe con: nected to space formed'by said lining and interior of casing and also a communication passage or channel 22 on opposite side of pump chamber.

9. In a centrifugal pump, the combination of an impeller, a casing inclosing the impeller and arranged to form a central space between it and the rear side of the impeller, a source of water supply connected with said space, and communicating passages in the impeller leading from said space to its periphery.

10. In a centrifugal pump, the combination of an impeller, a casinginclosing the impeller and arranged to form a central space etween it and the rear side of the impeller, a

source of water supply connected with said space, communicating passages in the impeller leading from said space to its periphery, and. balancing valves controlling the said communicating passages at the outer ends thereof.

- In testimony whereof, I have attached my signature to this specification in the presence of two subscribing witnesses.

FERDINAND W. KROGH. Witnesses:

ALPHEUS BULL,

W. P. J oHNsoN. 

